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Hi,

The ECal always has a 20 mm gap on top and bottom prior to the December
commissioning run. The survey in December of the position of the ECal
indicated that the top half gap is at ~23mm while the bottom half has a gap
of 20 mm.

We are still waiting to see the result from the most recent survey done
this past week, but it is not expected to be significantly different.

-Holly

On Fri, Mar 6, 2015 at 1:46 PM, Graf, Norman A. <[log in to unmask]>
wrote:

> Hello All,
>  Can someone from the ECal comment on what the geometry should be?
> HPS-Proposal2014-v9-2pt2 has a symmetric layout of the top and bottom
> beamgap of 20mm
>
>         <detector id="13" name="Ecal" type="HPSEcal3"
> insideTrackingVolume="false" readout="EcalHits" vis="ECALVis">
>             <comment>The crystal ECal</comment>
>             <material name="LeadTungstate" />
>             <dimensions x1="ecal_front" y1="ecal_front" x2="ecal_back"
> y2="ecal_back" z="ecal_z" />
>             <layout beamgap="20.0*mm" nx="46" ny="5" dface="ecal_dface">
>                 <remove ixmin="-10" ixmax="-2" iymin="-1" iymax="1" />
>                 <top dx="ecal_dface*tan(beam_angle)" dy="0." dz="0."/>
>                 <bottom dx="ecal_dface*tan(beam_angle)" dy="0." dz="0."/>
>             </layout>
>         </detector>
>
> Whereas HPS-ECalCommissioning-v2 has 20mm on the bottom and 23mm on the top
>
>         <detector id="13" name="Ecal" type="HPSEcal3"
> insideTrackingVolume="false" readout="EcalHits" vis="ECALVis">
>             <comment>The crystal ECal</comment>
>             <material name="LeadTungstate" />
>             <dimensions x1="ecal_front" y1="ecal_front" x2="ecal_back"
> y2="ecal_back" z="ecal_z" />
>             <layout beamgapBottom="20.0*mm" beamgapTop="23.0*mm" nx="46"
> ny="5" dface="ecal_dface">
>                 <remove ixmin="-10" ixmax="-2" iymin="-1" iymax="1" />
>                 <top dx="ecal_dface*tan(beam_angle)" dy="0." dz="0."/>
>                 <bottom dx="ecal_dface*tan(beam_angle)" dy="0." dz="0."/>
>             </layout>
>         </detector>
>
>
> Thanks,
> Norman
>
> From: Hansson Adrian, Per Ola
> Sent: Thursday, March 05, 2015 4:04 PM
> To: Graf, Norman A.
> Cc: hps-software
> Subject: Re: New geometry release
>
> Hi Norman,
>
> I don't know. The ECal in v9 is the same as v8. I didn't touch anything
> else than the tracker.
>
> /Pelle
>
>
>
> On Mar 5, 2015, at 3:57 PM, Graf, Norman A. <[log in to unmask]>
> wrote:
>
>
> Hello Pelle,
> I note that the ECal description has a symmetric beam gap for top and
> bottom. Was the asymmetry that we had in December fixed?
> Norman
>
> From: [log in to unmask] [mailto:
> [log in to unmask]] On Behalf Of Hansson Adrian, Per Ola
> Sent: Thursday, March 05, 2015 10:34 AM
> To: hps-software
> Subject: New geometry release
>
> Hi All,
>
> I've created a new geometry release v9: HPS-Proposal2014-v9-2pt2
>
> If is a straight copy of v8 except:
>
> * It has the new tracker geometry that we need for the counting house
> (opening angle can be adjusted easily).
>
> * I removed the "field definition" planes.
>
> * I removed the "recoil" sensors
>
> The new tracker geometry has been tested extensively on particle gun type
> events and also A' events. As far as I'm concerned it can be the new
> standard geometry, both for the counting house and for offline.
>
> For anyone doing work of the online monitoring or offline DQM please
> switch to this detector in order to exercise the real thing.
>
> The surveyed tracker geometry will be a new release in the coming days.
> Sho and I need to crunch the numbers.
>
>  Let me know if there is any questions.
>
> /pelle
>
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